One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(3,7)(9,10,13,14)(11,12,16,15)(17,18,22,23)(19,21,20,24)(25,26)(27,33)(28,35)(29,32)(30,31)(34,40)(36,37)(38,39)(1,2,5,4)(3,8,7,6)(9,10)(11,12)(13,14)(15,16)(18,23)(19,20)(26,31)(28,33)(32,39)(36,40)(2,4)(6,8)(10,14)(12,15)(17,19,22,20)(18,24,23,21)(25,27)(26,28)(29,37)(30,35)(31,33)(32,40)(34,38)(36,39)(1,3,5,7)(2,6,4,8)(9,11)(10,15)(12,14)(13,16)(17,20,22,19)(18,24,23,21)(25,28)(26,27)(29,36)(30,33)(31,35)(32,34)(37,39)(38,40)(1,4,5,2)(3,8,7,6)(9,12,13,15)(10,11,14,16)(17,21,22,24)(18,19,23,20)(25,29)(26,32)(27,34)(28,36)(30,38)(31,39)(33,40)(35,37)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.